OpenCores
URL https://opencores.org/ocsvn/test_project/test_project/trunk

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [hvsi.c] - Blame information for rev 65

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 62 marcus.erl
/*
2
 * Copyright (C) 2004 Hollis Blanchard <hollisb@us.ibm.com>, IBM
3
 *
4
 * This program is free software; you can redistribute it and/or modify
5
 * it under the terms of the GNU General Public License as published by
6
 * the Free Software Foundation; either version 2 of the License, or
7
 * (at your option) any later version.
8
 *
9
 * This program is distributed in the hope that it will be useful,
10
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
 * GNU General Public License for more details.
13
 *
14
 * You should have received a copy of the GNU General Public License
15
 * along with this program; if not, write to the Free Software
16
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
17
 */
18
 
19
/* Host Virtual Serial Interface (HVSI) is a protocol between the hosted OS
20
 * and the service processor on IBM pSeries servers. On these servers, there
21
 * are no serial ports under the OS's control, and sometimes there is no other
22
 * console available either. However, the service processor has two standard
23
 * serial ports, so this over-complicated protocol allows the OS to control
24
 * those ports by proxy.
25
 *
26
 * Besides data, the procotol supports the reading/writing of the serial
27
 * port's DTR line, and the reading of the CD line. This is to allow the OS to
28
 * control a modem attached to the service processor's serial port. Note that
29
 * the OS cannot change the speed of the port through this protocol.
30
 */
31
 
32
#undef DEBUG
33
 
34
#include <linux/console.h>
35
#include <linux/ctype.h>
36
#include <linux/delay.h>
37
#include <linux/init.h>
38
#include <linux/interrupt.h>
39
#include <linux/module.h>
40
#include <linux/major.h>
41
#include <linux/kernel.h>
42
#include <linux/spinlock.h>
43
#include <linux/sysrq.h>
44
#include <linux/tty.h>
45
#include <linux/tty_flip.h>
46
#include <asm/hvcall.h>
47
#include <asm/hvconsole.h>
48
#include <asm/prom.h>
49
#include <asm/uaccess.h>
50
#include <asm/vio.h>
51
#include <asm/param.h>
52
 
53
#define HVSI_MAJOR      229
54
#define HVSI_MINOR      128
55
#define MAX_NR_HVSI_CONSOLES 4
56
 
57
#define HVSI_TIMEOUT (5*HZ)
58
#define HVSI_VERSION 1
59
#define HVSI_MAX_PACKET 256
60
#define HVSI_MAX_READ 16
61
#define HVSI_MAX_OUTGOING_DATA 12
62
#define N_OUTBUF 12
63
 
64
/*
65
 * we pass data via two 8-byte registers, so we would like our char arrays
66
 * properly aligned for those loads.
67
 */
68
#define __ALIGNED__     __attribute__((__aligned__(sizeof(long))))
69
 
70
struct hvsi_struct {
71
        struct delayed_work writer;
72
        struct work_struct handshaker;
73
        wait_queue_head_t emptyq; /* woken when outbuf is emptied */
74
        wait_queue_head_t stateq; /* woken when HVSI state changes */
75
        spinlock_t lock;
76
        int index;
77
        struct tty_struct *tty;
78
        unsigned int count;
79
        uint8_t throttle_buf[128];
80
        uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */
81
        /* inbuf is for packet reassembly. leave a little room for leftovers. */
82
        uint8_t inbuf[HVSI_MAX_PACKET + HVSI_MAX_READ];
83
        uint8_t *inbuf_end;
84
        int n_throttle;
85
        int n_outbuf;
86
        uint32_t vtermno;
87
        uint32_t virq;
88
        atomic_t seqno; /* HVSI packet sequence number */
89
        uint16_t mctrl;
90
        uint8_t state;  /* HVSI protocol state */
91
        uint8_t flags;
92
#ifdef CONFIG_MAGIC_SYSRQ
93
        uint8_t sysrq;
94
#endif /* CONFIG_MAGIC_SYSRQ */
95
};
96
static struct hvsi_struct hvsi_ports[MAX_NR_HVSI_CONSOLES];
97
 
98
static struct tty_driver *hvsi_driver;
99
static int hvsi_count;
100
static int (*hvsi_wait)(struct hvsi_struct *hp, int state);
101
 
102
enum HVSI_PROTOCOL_STATE {
103
        HVSI_CLOSED,
104
        HVSI_WAIT_FOR_VER_RESPONSE,
105
        HVSI_WAIT_FOR_VER_QUERY,
106
        HVSI_OPEN,
107
        HVSI_WAIT_FOR_MCTRL_RESPONSE,
108
        HVSI_FSP_DIED,
109
};
110
#define HVSI_CONSOLE 0x1
111
 
112
#define VS_DATA_PACKET_HEADER           0xff
113
#define VS_CONTROL_PACKET_HEADER        0xfe
114
#define VS_QUERY_PACKET_HEADER          0xfd
115
#define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc
116
 
117
/* control verbs */
118
#define VSV_SET_MODEM_CTL    1 /* to service processor only */
119
#define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */
120
#define VSV_CLOSE_PROTOCOL   3
121
 
122
/* query verbs */
123
#define VSV_SEND_VERSION_NUMBER 1
124
#define VSV_SEND_MODEM_CTL_STATUS 2
125
 
126
/* yes, these masks are not consecutive. */
127
#define HVSI_TSDTR 0x01
128
#define HVSI_TSCD  0x20
129
 
130
struct hvsi_header {
131
        uint8_t  type;
132
        uint8_t  len;
133
        uint16_t seqno;
134
} __attribute__((packed));
135
 
136
struct hvsi_data {
137
        uint8_t  type;
138
        uint8_t  len;
139
        uint16_t seqno;
140
        uint8_t  data[HVSI_MAX_OUTGOING_DATA];
141
} __attribute__((packed));
142
 
143
struct hvsi_control {
144
        uint8_t  type;
145
        uint8_t  len;
146
        uint16_t seqno;
147
        uint16_t verb;
148
        /* optional depending on verb: */
149
        uint32_t word;
150
        uint32_t mask;
151
} __attribute__((packed));
152
 
153
struct hvsi_query {
154
        uint8_t  type;
155
        uint8_t  len;
156
        uint16_t seqno;
157
        uint16_t verb;
158
} __attribute__((packed));
159
 
160
struct hvsi_query_response {
161
        uint8_t  type;
162
        uint8_t  len;
163
        uint16_t seqno;
164
        uint16_t verb;
165
        uint16_t query_seqno;
166
        union {
167
                uint8_t  version;
168
                uint32_t mctrl_word;
169
        } u;
170
} __attribute__((packed));
171
 
172
 
173
 
174
static inline int is_console(struct hvsi_struct *hp)
175
{
176
        return hp->flags & HVSI_CONSOLE;
177
}
178
 
179
static inline int is_open(struct hvsi_struct *hp)
180
{
181
        /* if we're waiting for an mctrl then we're already open */
182
        return (hp->state == HVSI_OPEN)
183
                        || (hp->state == HVSI_WAIT_FOR_MCTRL_RESPONSE);
184
}
185
 
186
static inline void print_state(struct hvsi_struct *hp)
187
{
188
#ifdef DEBUG
189
        static const char *state_names[] = {
190
                "HVSI_CLOSED",
191
                "HVSI_WAIT_FOR_VER_RESPONSE",
192
                "HVSI_WAIT_FOR_VER_QUERY",
193
                "HVSI_OPEN",
194
                "HVSI_WAIT_FOR_MCTRL_RESPONSE",
195
                "HVSI_FSP_DIED",
196
        };
197
        const char *name = state_names[hp->state];
198
 
199
        if (hp->state > ARRAY_SIZE(state_names))
200
                name = "UNKNOWN";
201
 
202
        pr_debug("hvsi%i: state = %s\n", hp->index, name);
203
#endif /* DEBUG */
204
}
205
 
206
static inline void __set_state(struct hvsi_struct *hp, int state)
207
{
208
        hp->state = state;
209
        print_state(hp);
210
        wake_up_all(&hp->stateq);
211
}
212
 
213
static inline void set_state(struct hvsi_struct *hp, int state)
214
{
215
        unsigned long flags;
216
 
217
        spin_lock_irqsave(&hp->lock, flags);
218
        __set_state(hp, state);
219
        spin_unlock_irqrestore(&hp->lock, flags);
220
}
221
 
222
static inline int len_packet(const uint8_t *packet)
223
{
224
        return (int)((struct hvsi_header *)packet)->len;
225
}
226
 
227
static inline int is_header(const uint8_t *packet)
228
{
229
        struct hvsi_header *header = (struct hvsi_header *)packet;
230
        return header->type >= VS_QUERY_RESPONSE_PACKET_HEADER;
231
}
232
 
233
static inline int got_packet(const struct hvsi_struct *hp, uint8_t *packet)
234
{
235
        if (hp->inbuf_end < packet + sizeof(struct hvsi_header))
236
                return 0; /* don't even have the packet header */
237
 
238
        if (hp->inbuf_end < (packet + len_packet(packet)))
239
                return 0; /* don't have the rest of the packet */
240
 
241
        return 1;
242
}
243
 
244
/* shift remaining bytes in packetbuf down */
245
static void compact_inbuf(struct hvsi_struct *hp, uint8_t *read_to)
246
{
247
        int remaining = (int)(hp->inbuf_end - read_to);
248
 
249
        pr_debug("%s: %i chars remain\n", __FUNCTION__, remaining);
250
 
251
        if (read_to != hp->inbuf)
252
                memmove(hp->inbuf, read_to, remaining);
253
 
254
        hp->inbuf_end = hp->inbuf + remaining;
255
}
256
 
257
#ifdef DEBUG
258
#define dbg_dump_packet(packet) dump_packet(packet)
259
#define dbg_dump_hex(data, len) dump_hex(data, len)
260
#else
261
#define dbg_dump_packet(packet) do { } while (0)
262
#define dbg_dump_hex(data, len) do { } while (0)
263
#endif
264
 
265
static void dump_hex(const uint8_t *data, int len)
266
{
267
        int i;
268
 
269
        printk("    ");
270
        for (i=0; i < len; i++)
271
                printk("%.2x", data[i]);
272
 
273
        printk("\n    ");
274
        for (i=0; i < len; i++) {
275
                if (isprint(data[i]))
276
                        printk("%c", data[i]);
277
                else
278
                        printk(".");
279
        }
280
        printk("\n");
281
}
282
 
283
static void dump_packet(uint8_t *packet)
284
{
285
        struct hvsi_header *header = (struct hvsi_header *)packet;
286
 
287
        printk("type 0x%x, len %i, seqno %i:\n", header->type, header->len,
288
                        header->seqno);
289
 
290
        dump_hex(packet, header->len);
291
}
292
 
293
static int hvsi_read(struct hvsi_struct *hp, char *buf, int count)
294
{
295
        unsigned long got;
296
 
297
        got = hvc_get_chars(hp->vtermno, buf, count);
298
 
299
        return got;
300
}
301
 
302
static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet,
303
        struct tty_struct **to_hangup, struct hvsi_struct **to_handshake)
304
{
305
        struct hvsi_control *header = (struct hvsi_control *)packet;
306
 
307
        switch (header->verb) {
308
                case VSV_MODEM_CTL_UPDATE:
309
                        if ((header->word & HVSI_TSCD) == 0) {
310
                                /* CD went away; no more connection */
311
                                pr_debug("hvsi%i: CD dropped\n", hp->index);
312
                                hp->mctrl &= TIOCM_CD;
313
                                /* If userland hasn't done an open(2) yet, hp->tty is NULL. */
314
                                if (hp->tty && !(hp->tty->flags & CLOCAL))
315
                                        *to_hangup = hp->tty;
316
                        }
317
                        break;
318
                case VSV_CLOSE_PROTOCOL:
319
                        pr_debug("hvsi%i: service processor came back\n", hp->index);
320
                        if (hp->state != HVSI_CLOSED) {
321
                                *to_handshake = hp;
322
                        }
323
                        break;
324
                default:
325
                        printk(KERN_WARNING "hvsi%i: unknown HVSI control packet: ",
326
                                hp->index);
327
                        dump_packet(packet);
328
                        break;
329
        }
330
}
331
 
332
static void hvsi_recv_response(struct hvsi_struct *hp, uint8_t *packet)
333
{
334
        struct hvsi_query_response *resp = (struct hvsi_query_response *)packet;
335
 
336
        switch (hp->state) {
337
                case HVSI_WAIT_FOR_VER_RESPONSE:
338
                        __set_state(hp, HVSI_WAIT_FOR_VER_QUERY);
339
                        break;
340
                case HVSI_WAIT_FOR_MCTRL_RESPONSE:
341
                        hp->mctrl = 0;
342
                        if (resp->u.mctrl_word & HVSI_TSDTR)
343
                                hp->mctrl |= TIOCM_DTR;
344
                        if (resp->u.mctrl_word & HVSI_TSCD)
345
                                hp->mctrl |= TIOCM_CD;
346
                        __set_state(hp, HVSI_OPEN);
347
                        break;
348
                default:
349
                        printk(KERN_ERR "hvsi%i: unexpected query response: ", hp->index);
350
                        dump_packet(packet);
351
                        break;
352
        }
353
}
354
 
355
/* respond to service processor's version query */
356
static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno)
357
{
358
        struct hvsi_query_response packet __ALIGNED__;
359
        int wrote;
360
 
361
        packet.type = VS_QUERY_RESPONSE_PACKET_HEADER;
362
        packet.len = sizeof(struct hvsi_query_response);
363
        packet.seqno = atomic_inc_return(&hp->seqno);
364
        packet.verb = VSV_SEND_VERSION_NUMBER;
365
        packet.u.version = HVSI_VERSION;
366
        packet.query_seqno = query_seqno+1;
367
 
368
        pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
369
        dbg_dump_hex((uint8_t*)&packet, packet.len);
370
 
371
        wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
372
        if (wrote != packet.len) {
373
                printk(KERN_ERR "hvsi%i: couldn't send query response!\n",
374
                        hp->index);
375
                return -EIO;
376
        }
377
 
378
        return 0;
379
}
380
 
381
static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet)
382
{
383
        struct hvsi_query *query = (struct hvsi_query *)packet;
384
 
385
        switch (hp->state) {
386
                case HVSI_WAIT_FOR_VER_QUERY:
387
                        hvsi_version_respond(hp, query->seqno);
388
                        __set_state(hp, HVSI_OPEN);
389
                        break;
390
                default:
391
                        printk(KERN_ERR "hvsi%i: unexpected query: ", hp->index);
392
                        dump_packet(packet);
393
                        break;
394
        }
395
}
396
 
397
static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len)
398
{
399
        int i;
400
 
401
        for (i=0; i < len; i++) {
402
                char c = buf[i];
403
#ifdef CONFIG_MAGIC_SYSRQ
404
                if (c == '\0') {
405
                        hp->sysrq = 1;
406
                        continue;
407
                } else if (hp->sysrq) {
408
                        handle_sysrq(c, hp->tty);
409
                        hp->sysrq = 0;
410
                        continue;
411
                }
412
#endif /* CONFIG_MAGIC_SYSRQ */
413
                tty_insert_flip_char(hp->tty, c, 0);
414
        }
415
}
416
 
417
/*
418
 * We could get 252 bytes of data at once here. But the tty layer only
419
 * throttles us at TTY_THRESHOLD_THROTTLE (128) bytes, so we could overflow
420
 * it. Accordingly we won't send more than 128 bytes at a time to the flip
421
 * buffer, which will give the tty buffer a chance to throttle us. Should the
422
 * value of TTY_THRESHOLD_THROTTLE change in n_tty.c, this code should be
423
 * revisited.
424
 */
425
#define TTY_THRESHOLD_THROTTLE 128
426
static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp,
427
                const uint8_t *packet)
428
{
429
        const struct hvsi_header *header = (const struct hvsi_header *)packet;
430
        const uint8_t *data = packet + sizeof(struct hvsi_header);
431
        int datalen = header->len - sizeof(struct hvsi_header);
432
        int overflow = datalen - TTY_THRESHOLD_THROTTLE;
433
 
434
        pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data);
435
 
436
        if (datalen == 0)
437
                return NULL;
438
 
439
        if (overflow > 0) {
440
                pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __FUNCTION__);
441
                datalen = TTY_THRESHOLD_THROTTLE;
442
        }
443
 
444
        hvsi_insert_chars(hp, data, datalen);
445
 
446
        if (overflow > 0) {
447
                /*
448
                 * we still have more data to deliver, so we need to save off the
449
                 * overflow and send it later
450
                 */
451
                pr_debug("%s: deferring overflow\n", __FUNCTION__);
452
                memcpy(hp->throttle_buf, data + TTY_THRESHOLD_THROTTLE, overflow);
453
                hp->n_throttle = overflow;
454
        }
455
 
456
        return hp->tty;
457
}
458
 
459
/*
460
 * Returns true/false indicating data successfully read from hypervisor.
461
 * Used both to get packets for tty connections and to advance the state
462
 * machine during console handshaking (in which case tty = NULL and we ignore
463
 * incoming data).
464
 */
465
static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip,
466
                struct tty_struct **hangup, struct hvsi_struct **handshake)
467
{
468
        uint8_t *packet = hp->inbuf;
469
        int chunklen;
470
 
471
        *flip = NULL;
472
        *hangup = NULL;
473
        *handshake = NULL;
474
 
475
        chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ);
476
        if (chunklen == 0) {
477
                pr_debug("%s: 0-length read\n", __FUNCTION__);
478
                return 0;
479
        }
480
 
481
        pr_debug("%s: got %i bytes\n", __FUNCTION__, chunklen);
482
        dbg_dump_hex(hp->inbuf_end, chunklen);
483
 
484
        hp->inbuf_end += chunklen;
485
 
486
        /* handle all completed packets */
487
        while ((packet < hp->inbuf_end) && got_packet(hp, packet)) {
488
                struct hvsi_header *header = (struct hvsi_header *)packet;
489
 
490
                if (!is_header(packet)) {
491
                        printk(KERN_ERR "hvsi%i: got malformed packet\n", hp->index);
492
                        /* skip bytes until we find a header or run out of data */
493
                        while ((packet < hp->inbuf_end) && (!is_header(packet)))
494
                                packet++;
495
                        continue;
496
                }
497
 
498
                pr_debug("%s: handling %i-byte packet\n", __FUNCTION__,
499
                                len_packet(packet));
500
                dbg_dump_packet(packet);
501
 
502
                switch (header->type) {
503
                        case VS_DATA_PACKET_HEADER:
504
                                if (!is_open(hp))
505
                                        break;
506
                                if (hp->tty == NULL)
507
                                        break; /* no tty buffer to put data in */
508
                                *flip = hvsi_recv_data(hp, packet);
509
                                break;
510
                        case VS_CONTROL_PACKET_HEADER:
511
                                hvsi_recv_control(hp, packet, hangup, handshake);
512
                                break;
513
                        case VS_QUERY_RESPONSE_PACKET_HEADER:
514
                                hvsi_recv_response(hp, packet);
515
                                break;
516
                        case VS_QUERY_PACKET_HEADER:
517
                                hvsi_recv_query(hp, packet);
518
                                break;
519
                        default:
520
                                printk(KERN_ERR "hvsi%i: unknown HVSI packet type 0x%x\n",
521
                                                hp->index, header->type);
522
                                dump_packet(packet);
523
                                break;
524
                }
525
 
526
                packet += len_packet(packet);
527
 
528
                if (*hangup || *handshake) {
529
                        pr_debug("%s: hangup or handshake\n", __FUNCTION__);
530
                        /*
531
                         * we need to send the hangup now before receiving any more data.
532
                         * If we get "data, hangup, data", we can't deliver the second
533
                         * data before the hangup.
534
                         */
535
                        break;
536
                }
537
        }
538
 
539
        compact_inbuf(hp, packet);
540
 
541
        return 1;
542
}
543
 
544
static void hvsi_send_overflow(struct hvsi_struct *hp)
545
{
546
        pr_debug("%s: delivering %i bytes overflow\n", __FUNCTION__,
547
                        hp->n_throttle);
548
 
549
        hvsi_insert_chars(hp, hp->throttle_buf, hp->n_throttle);
550
        hp->n_throttle = 0;
551
}
552
 
553
/*
554
 * must get all pending data because we only get an irq on empty->non-empty
555
 * transition
556
 */
557
static irqreturn_t hvsi_interrupt(int irq, void *arg)
558
{
559
        struct hvsi_struct *hp = (struct hvsi_struct *)arg;
560
        struct tty_struct *flip;
561
        struct tty_struct *hangup;
562
        struct hvsi_struct *handshake;
563
        unsigned long flags;
564
        int again = 1;
565
 
566
        pr_debug("%s\n", __FUNCTION__);
567
 
568
        while (again) {
569
                spin_lock_irqsave(&hp->lock, flags);
570
                again = hvsi_load_chunk(hp, &flip, &hangup, &handshake);
571
                spin_unlock_irqrestore(&hp->lock, flags);
572
 
573
                /*
574
                 * we have to call tty_flip_buffer_push() and tty_hangup() outside our
575
                 * spinlock. But we also have to keep going until we've read all the
576
                 * available data.
577
                 */
578
 
579
                if (flip) {
580
                        /* there was data put in the tty flip buffer */
581
                        tty_flip_buffer_push(flip);
582
                        flip = NULL;
583
                }
584
 
585
                if (hangup) {
586
                        tty_hangup(hangup);
587
                }
588
 
589
                if (handshake) {
590
                        pr_debug("hvsi%i: attempting re-handshake\n", handshake->index);
591
                        schedule_work(&handshake->handshaker);
592
                }
593
        }
594
 
595
        spin_lock_irqsave(&hp->lock, flags);
596
        if (hp->tty && hp->n_throttle
597
                        && (!test_bit(TTY_THROTTLED, &hp->tty->flags))) {
598
                /* we weren't hung up and we weren't throttled, so we can deliver the
599
                 * rest now */
600
                flip = hp->tty;
601
                hvsi_send_overflow(hp);
602
        }
603
        spin_unlock_irqrestore(&hp->lock, flags);
604
 
605
        if (flip) {
606
                tty_flip_buffer_push(flip);
607
        }
608
 
609
        return IRQ_HANDLED;
610
}
611
 
612
/* for boot console, before the irq handler is running */
613
static int __init poll_for_state(struct hvsi_struct *hp, int state)
614
{
615
        unsigned long end_jiffies = jiffies + HVSI_TIMEOUT;
616
 
617
        for (;;) {
618
                hvsi_interrupt(hp->virq, (void *)hp); /* get pending data */
619
 
620
                if (hp->state == state)
621
                        return 0;
622
 
623
                mdelay(5);
624
                if (time_after(jiffies, end_jiffies))
625
                        return -EIO;
626
        }
627
}
628
 
629
/* wait for irq handler to change our state */
630
static int wait_for_state(struct hvsi_struct *hp, int state)
631
{
632
        int ret = 0;
633
 
634
        if (!wait_event_timeout(hp->stateq, (hp->state == state), HVSI_TIMEOUT))
635
                ret = -EIO;
636
 
637
        return ret;
638
}
639
 
640
static int hvsi_query(struct hvsi_struct *hp, uint16_t verb)
641
{
642
        struct hvsi_query packet __ALIGNED__;
643
        int wrote;
644
 
645
        packet.type = VS_QUERY_PACKET_HEADER;
646
        packet.len = sizeof(struct hvsi_query);
647
        packet.seqno = atomic_inc_return(&hp->seqno);
648
        packet.verb = verb;
649
 
650
        pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
651
        dbg_dump_hex((uint8_t*)&packet, packet.len);
652
 
653
        wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
654
        if (wrote != packet.len) {
655
                printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index,
656
                        wrote);
657
                return -EIO;
658
        }
659
 
660
        return 0;
661
}
662
 
663
static int hvsi_get_mctrl(struct hvsi_struct *hp)
664
{
665
        int ret;
666
 
667
        set_state(hp, HVSI_WAIT_FOR_MCTRL_RESPONSE);
668
        hvsi_query(hp, VSV_SEND_MODEM_CTL_STATUS);
669
 
670
        ret = hvsi_wait(hp, HVSI_OPEN);
671
        if (ret < 0) {
672
                printk(KERN_ERR "hvsi%i: didn't get modem flags\n", hp->index);
673
                set_state(hp, HVSI_OPEN);
674
                return ret;
675
        }
676
 
677
        pr_debug("%s: mctrl 0x%x\n", __FUNCTION__, hp->mctrl);
678
 
679
        return 0;
680
}
681
 
682
/* note that we can only set DTR */
683
static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl)
684
{
685
        struct hvsi_control packet __ALIGNED__;
686
        int wrote;
687
 
688
        packet.type = VS_CONTROL_PACKET_HEADER,
689
        packet.seqno = atomic_inc_return(&hp->seqno);
690
        packet.len = sizeof(struct hvsi_control);
691
        packet.verb = VSV_SET_MODEM_CTL;
692
        packet.mask = HVSI_TSDTR;
693
 
694
        if (mctrl & TIOCM_DTR)
695
                packet.word = HVSI_TSDTR;
696
 
697
        pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
698
        dbg_dump_hex((uint8_t*)&packet, packet.len);
699
 
700
        wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
701
        if (wrote != packet.len) {
702
                printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index);
703
                return -EIO;
704
        }
705
 
706
        return 0;
707
}
708
 
709
static void hvsi_drain_input(struct hvsi_struct *hp)
710
{
711
        uint8_t buf[HVSI_MAX_READ] __ALIGNED__;
712
        unsigned long end_jiffies = jiffies + HVSI_TIMEOUT;
713
 
714
        while (time_before(end_jiffies, jiffies))
715
                if (0 == hvsi_read(hp, buf, HVSI_MAX_READ))
716
                        break;
717
}
718
 
719
static int hvsi_handshake(struct hvsi_struct *hp)
720
{
721
        int ret;
722
 
723
        /*
724
         * We could have a CLOSE or other data waiting for us before we even try
725
         * to open; try to throw it all away so we don't get confused. (CLOSE
726
         * is the first message sent up the pipe when the FSP comes online. We
727
         * need to distinguish between "it came up a while ago and we're the first
728
         * user" and "it was just reset before it saw our handshake packet".)
729
         */
730
        hvsi_drain_input(hp);
731
 
732
        set_state(hp, HVSI_WAIT_FOR_VER_RESPONSE);
733
        ret = hvsi_query(hp, VSV_SEND_VERSION_NUMBER);
734
        if (ret < 0) {
735
                printk(KERN_ERR "hvsi%i: couldn't send version query\n", hp->index);
736
                return ret;
737
        }
738
 
739
        ret = hvsi_wait(hp, HVSI_OPEN);
740
        if (ret < 0)
741
                return ret;
742
 
743
        return 0;
744
}
745
 
746
static void hvsi_handshaker(struct work_struct *work)
747
{
748
        struct hvsi_struct *hp =
749
                container_of(work, struct hvsi_struct, handshaker);
750
 
751
        if (hvsi_handshake(hp) >= 0)
752
                return;
753
 
754
        printk(KERN_ERR "hvsi%i: re-handshaking failed\n", hp->index);
755
        if (is_console(hp)) {
756
                /*
757
                 * ttys will re-attempt the handshake via hvsi_open, but
758
                 * the console will not.
759
                 */
760
                printk(KERN_ERR "hvsi%i: lost console!\n", hp->index);
761
        }
762
}
763
 
764
static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count)
765
{
766
        struct hvsi_data packet __ALIGNED__;
767
        int ret;
768
 
769
        BUG_ON(count > HVSI_MAX_OUTGOING_DATA);
770
 
771
        packet.type = VS_DATA_PACKET_HEADER;
772
        packet.seqno = atomic_inc_return(&hp->seqno);
773
        packet.len = count + sizeof(struct hvsi_header);
774
        memcpy(&packet.data, buf, count);
775
 
776
        ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
777
        if (ret == packet.len) {
778
                /* return the number of chars written, not the packet length */
779
                return count;
780
        }
781
        return ret; /* return any errors */
782
}
783
 
784
static void hvsi_close_protocol(struct hvsi_struct *hp)
785
{
786
        struct hvsi_control packet __ALIGNED__;
787
 
788
        packet.type = VS_CONTROL_PACKET_HEADER;
789
        packet.seqno = atomic_inc_return(&hp->seqno);
790
        packet.len = 6;
791
        packet.verb = VSV_CLOSE_PROTOCOL;
792
 
793
        pr_debug("%s: sending %i bytes\n", __FUNCTION__, packet.len);
794
        dbg_dump_hex((uint8_t*)&packet, packet.len);
795
 
796
        hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
797
}
798
 
799
static int hvsi_open(struct tty_struct *tty, struct file *filp)
800
{
801
        struct hvsi_struct *hp;
802
        unsigned long flags;
803
        int line = tty->index;
804
        int ret;
805
 
806
        pr_debug("%s\n", __FUNCTION__);
807
 
808
        if (line < 0 || line >= hvsi_count)
809
                return -ENODEV;
810
        hp = &hvsi_ports[line];
811
 
812
        tty->driver_data = hp;
813
        tty->low_latency = 1; /* avoid throttle/tty_flip_buffer_push race */
814
 
815
        mb();
816
        if (hp->state == HVSI_FSP_DIED)
817
                return -EIO;
818
 
819
        spin_lock_irqsave(&hp->lock, flags);
820
        hp->tty = tty;
821
        hp->count++;
822
        atomic_set(&hp->seqno, 0);
823
        h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
824
        spin_unlock_irqrestore(&hp->lock, flags);
825
 
826
        if (is_console(hp))
827
                return 0; /* this has already been handshaked as the console */
828
 
829
        ret = hvsi_handshake(hp);
830
        if (ret < 0) {
831
                printk(KERN_ERR "%s: HVSI handshaking failed\n", tty->name);
832
                return ret;
833
        }
834
 
835
        ret = hvsi_get_mctrl(hp);
836
        if (ret < 0) {
837
                printk(KERN_ERR "%s: couldn't get initial modem flags\n", tty->name);
838
                return ret;
839
        }
840
 
841
        ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR);
842
        if (ret < 0) {
843
                printk(KERN_ERR "%s: couldn't set DTR\n", tty->name);
844
                return ret;
845
        }
846
 
847
        return 0;
848
}
849
 
850
/* wait for hvsi_write_worker to empty hp->outbuf */
851
static void hvsi_flush_output(struct hvsi_struct *hp)
852
{
853
        wait_event_timeout(hp->emptyq, (hp->n_outbuf <= 0), HVSI_TIMEOUT);
854
 
855
        /* 'writer' could still be pending if it didn't see n_outbuf = 0 yet */
856
        cancel_delayed_work(&hp->writer);
857
        flush_scheduled_work();
858
 
859
        /*
860
         * it's also possible that our timeout expired and hvsi_write_worker
861
         * didn't manage to push outbuf. poof.
862
         */
863
        hp->n_outbuf = 0;
864
}
865
 
866
static void hvsi_close(struct tty_struct *tty, struct file *filp)
867
{
868
        struct hvsi_struct *hp = tty->driver_data;
869
        unsigned long flags;
870
 
871
        pr_debug("%s\n", __FUNCTION__);
872
 
873
        if (tty_hung_up_p(filp))
874
                return;
875
 
876
        spin_lock_irqsave(&hp->lock, flags);
877
 
878
        if (--hp->count == 0) {
879
                hp->tty = NULL;
880
                hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */
881
 
882
                /* only close down connection if it is not the console */
883
                if (!is_console(hp)) {
884
                        h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); /* no more irqs */
885
                        __set_state(hp, HVSI_CLOSED);
886
                        /*
887
                         * any data delivered to the tty layer after this will be
888
                         * discarded (except for XON/XOFF)
889
                         */
890
                        tty->closing = 1;
891
 
892
                        spin_unlock_irqrestore(&hp->lock, flags);
893
 
894
                        /* let any existing irq handlers finish. no more will start. */
895
                        synchronize_irq(hp->virq);
896
 
897
                        /* hvsi_write_worker will re-schedule until outbuf is empty. */
898
                        hvsi_flush_output(hp);
899
 
900
                        /* tell FSP to stop sending data */
901
                        hvsi_close_protocol(hp);
902
 
903
                        /*
904
                         * drain anything FSP is still in the middle of sending, and let
905
                         * hvsi_handshake drain the rest on the next open.
906
                         */
907
                        hvsi_drain_input(hp);
908
 
909
                        spin_lock_irqsave(&hp->lock, flags);
910
                }
911
        } else if (hp->count < 0)
912
                printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n",
913
                       hp - hvsi_ports, hp->count);
914
 
915
        spin_unlock_irqrestore(&hp->lock, flags);
916
}
917
 
918
static void hvsi_hangup(struct tty_struct *tty)
919
{
920
        struct hvsi_struct *hp = tty->driver_data;
921
        unsigned long flags;
922
 
923
        pr_debug("%s\n", __FUNCTION__);
924
 
925
        spin_lock_irqsave(&hp->lock, flags);
926
 
927
        hp->count = 0;
928
        hp->n_outbuf = 0;
929
        hp->tty = NULL;
930
 
931
        spin_unlock_irqrestore(&hp->lock, flags);
932
}
933
 
934
/* called with hp->lock held */
935
static void hvsi_push(struct hvsi_struct *hp)
936
{
937
        int n;
938
 
939
        if (hp->n_outbuf <= 0)
940
                return;
941
 
942
        n = hvsi_put_chars(hp, hp->outbuf, hp->n_outbuf);
943
        if (n > 0) {
944
                /* success */
945
                pr_debug("%s: wrote %i chars\n", __FUNCTION__, n);
946
                hp->n_outbuf = 0;
947
        } else if (n == -EIO) {
948
                __set_state(hp, HVSI_FSP_DIED);
949
                printk(KERN_ERR "hvsi%i: service processor died\n", hp->index);
950
        }
951
}
952
 
953
/* hvsi_write_worker will keep rescheduling itself until outbuf is empty */
954
static void hvsi_write_worker(struct work_struct *work)
955
{
956
        struct hvsi_struct *hp =
957
                container_of(work, struct hvsi_struct, writer.work);
958
        unsigned long flags;
959
#ifdef DEBUG
960
        static long start_j = 0;
961
 
962
        if (start_j == 0)
963
                start_j = jiffies;
964
#endif /* DEBUG */
965
 
966
        spin_lock_irqsave(&hp->lock, flags);
967
 
968
        pr_debug("%s: %i chars in buffer\n", __FUNCTION__, hp->n_outbuf);
969
 
970
        if (!is_open(hp)) {
971
                /*
972
                 * We could have a non-open connection if the service processor died
973
                 * while we were busily scheduling ourselves. In that case, it could
974
                 * be minutes before the service processor comes back, so only try
975
                 * again once a second.
976
                 */
977
                schedule_delayed_work(&hp->writer, HZ);
978
                goto out;
979
        }
980
 
981
        hvsi_push(hp);
982
        if (hp->n_outbuf > 0)
983
                schedule_delayed_work(&hp->writer, 10);
984
        else {
985
#ifdef DEBUG
986
                pr_debug("%s: outbuf emptied after %li jiffies\n", __FUNCTION__,
987
                                jiffies - start_j);
988
                start_j = 0;
989
#endif /* DEBUG */
990
                wake_up_all(&hp->emptyq);
991
                tty_wakeup(hp->tty);
992
        }
993
 
994
out:
995
        spin_unlock_irqrestore(&hp->lock, flags);
996
}
997
 
998
static int hvsi_write_room(struct tty_struct *tty)
999
{
1000
        struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
1001
 
1002
        return N_OUTBUF - hp->n_outbuf;
1003
}
1004
 
1005
static int hvsi_chars_in_buffer(struct tty_struct *tty)
1006
{
1007
        struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
1008
 
1009
        return hp->n_outbuf;
1010
}
1011
 
1012
static int hvsi_write(struct tty_struct *tty,
1013
                     const unsigned char *buf, int count)
1014
{
1015
        struct hvsi_struct *hp = tty->driver_data;
1016
        const char *source = buf;
1017
        unsigned long flags;
1018
        int total = 0;
1019
        int origcount = count;
1020
 
1021
        spin_lock_irqsave(&hp->lock, flags);
1022
 
1023
        pr_debug("%s: %i chars in buffer\n", __FUNCTION__, hp->n_outbuf);
1024
 
1025
        if (!is_open(hp)) {
1026
                /* we're either closing or not yet open; don't accept data */
1027
                pr_debug("%s: not open\n", __FUNCTION__);
1028
                goto out;
1029
        }
1030
 
1031
        /*
1032
         * when the hypervisor buffer (16K) fills, data will stay in hp->outbuf
1033
         * and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls
1034
         * will see there is no room in outbuf and return.
1035
         */
1036
        while ((count > 0) && (hvsi_write_room(hp->tty) > 0)) {
1037
                int chunksize = min(count, hvsi_write_room(hp->tty));
1038
 
1039
                BUG_ON(hp->n_outbuf < 0);
1040
                memcpy(hp->outbuf + hp->n_outbuf, source, chunksize);
1041
                hp->n_outbuf += chunksize;
1042
 
1043
                total += chunksize;
1044
                source += chunksize;
1045
                count -= chunksize;
1046
                hvsi_push(hp);
1047
        }
1048
 
1049
        if (hp->n_outbuf > 0) {
1050
                /*
1051
                 * we weren't able to write it all to the hypervisor.
1052
                 * schedule another push attempt.
1053
                 */
1054
                schedule_delayed_work(&hp->writer, 10);
1055
        }
1056
 
1057
out:
1058
        spin_unlock_irqrestore(&hp->lock, flags);
1059
 
1060
        if (total != origcount)
1061
                pr_debug("%s: wanted %i, only wrote %i\n", __FUNCTION__, origcount,
1062
                        total);
1063
 
1064
        return total;
1065
}
1066
 
1067
/*
1068
 * I have never seen throttle or unthrottle called, so this little throttle
1069
 * buffering scheme may or may not work.
1070
 */
1071
static void hvsi_throttle(struct tty_struct *tty)
1072
{
1073
        struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
1074
 
1075
        pr_debug("%s\n", __FUNCTION__);
1076
 
1077
        h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE);
1078
}
1079
 
1080
static void hvsi_unthrottle(struct tty_struct *tty)
1081
{
1082
        struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
1083
        unsigned long flags;
1084
        int shouldflip = 0;
1085
 
1086
        pr_debug("%s\n", __FUNCTION__);
1087
 
1088
        spin_lock_irqsave(&hp->lock, flags);
1089
        if (hp->n_throttle) {
1090
                hvsi_send_overflow(hp);
1091
                shouldflip = 1;
1092
        }
1093
        spin_unlock_irqrestore(&hp->lock, flags);
1094
 
1095
        if (shouldflip)
1096
                tty_flip_buffer_push(hp->tty);
1097
 
1098
        h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
1099
}
1100
 
1101
static int hvsi_tiocmget(struct tty_struct *tty, struct file *file)
1102
{
1103
        struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
1104
 
1105
        hvsi_get_mctrl(hp);
1106
        return hp->mctrl;
1107
}
1108
 
1109
static int hvsi_tiocmset(struct tty_struct *tty, struct file *file,
1110
                unsigned int set, unsigned int clear)
1111
{
1112
        struct hvsi_struct *hp = (struct hvsi_struct *)tty->driver_data;
1113
        unsigned long flags;
1114
        uint16_t new_mctrl;
1115
 
1116
        /* we can only alter DTR */
1117
        clear &= TIOCM_DTR;
1118
        set &= TIOCM_DTR;
1119
 
1120
        spin_lock_irqsave(&hp->lock, flags);
1121
 
1122
        new_mctrl = (hp->mctrl & ~clear) | set;
1123
 
1124
        if (hp->mctrl != new_mctrl) {
1125
                hvsi_set_mctrl(hp, new_mctrl);
1126
                hp->mctrl = new_mctrl;
1127
        }
1128
        spin_unlock_irqrestore(&hp->lock, flags);
1129
 
1130
        return 0;
1131
}
1132
 
1133
 
1134
static const struct tty_operations hvsi_ops = {
1135
        .open = hvsi_open,
1136
        .close = hvsi_close,
1137
        .write = hvsi_write,
1138
        .hangup = hvsi_hangup,
1139
        .write_room = hvsi_write_room,
1140
        .chars_in_buffer = hvsi_chars_in_buffer,
1141
        .throttle = hvsi_throttle,
1142
        .unthrottle = hvsi_unthrottle,
1143
        .tiocmget = hvsi_tiocmget,
1144
        .tiocmset = hvsi_tiocmset,
1145
};
1146
 
1147
static int __init hvsi_init(void)
1148
{
1149
        int i;
1150
 
1151
        hvsi_driver = alloc_tty_driver(hvsi_count);
1152
        if (!hvsi_driver)
1153
                return -ENOMEM;
1154
 
1155
        hvsi_driver->owner = THIS_MODULE;
1156
        hvsi_driver->driver_name = "hvsi";
1157
        hvsi_driver->name = "hvsi";
1158
        hvsi_driver->major = HVSI_MAJOR;
1159
        hvsi_driver->minor_start = HVSI_MINOR;
1160
        hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM;
1161
        hvsi_driver->init_termios = tty_std_termios;
1162
        hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
1163
        hvsi_driver->init_termios.c_ispeed = 9600;
1164
        hvsi_driver->init_termios.c_ospeed = 9600;
1165
        hvsi_driver->flags = TTY_DRIVER_REAL_RAW;
1166
        tty_set_operations(hvsi_driver, &hvsi_ops);
1167
 
1168
        for (i=0; i < hvsi_count; i++) {
1169
                struct hvsi_struct *hp = &hvsi_ports[i];
1170
                int ret = 1;
1171
 
1172
                ret = request_irq(hp->virq, hvsi_interrupt, IRQF_DISABLED, "hvsi", hp);
1173
                if (ret)
1174
                        printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n",
1175
                                hp->virq, ret);
1176
        }
1177
        hvsi_wait = wait_for_state; /* irqs active now */
1178
 
1179
        if (tty_register_driver(hvsi_driver))
1180
                panic("Couldn't register hvsi console driver\n");
1181
 
1182
        printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count);
1183
 
1184
        return 0;
1185
}
1186
device_initcall(hvsi_init);
1187
 
1188
/***** console (not tty) code: *****/
1189
 
1190
static void hvsi_console_print(struct console *console, const char *buf,
1191
                unsigned int count)
1192
{
1193
        struct hvsi_struct *hp = &hvsi_ports[console->index];
1194
        char c[HVSI_MAX_OUTGOING_DATA] __ALIGNED__;
1195
        unsigned int i = 0, n = 0;
1196
        int ret, donecr = 0;
1197
 
1198
        mb();
1199
        if (!is_open(hp))
1200
                return;
1201
 
1202
        /*
1203
         * ugh, we have to translate LF -> CRLF ourselves, in place.
1204
         * copied from hvc_console.c:
1205
         */
1206
        while (count > 0 || i > 0) {
1207
                if (count > 0 && i < sizeof(c)) {
1208
                        if (buf[n] == '\n' && !donecr) {
1209
                                c[i++] = '\r';
1210
                                donecr = 1;
1211
                        } else {
1212
                                c[i++] = buf[n++];
1213
                                donecr = 0;
1214
                                --count;
1215
                        }
1216
                } else {
1217
                        ret = hvsi_put_chars(hp, c, i);
1218
                        if (ret < 0)
1219
                                i = 0;
1220
                        i -= ret;
1221
                }
1222
        }
1223
}
1224
 
1225
static struct tty_driver *hvsi_console_device(struct console *console,
1226
        int *index)
1227
{
1228
        *index = console->index;
1229
        return hvsi_driver;
1230
}
1231
 
1232
static int __init hvsi_console_setup(struct console *console, char *options)
1233
{
1234
        struct hvsi_struct *hp = &hvsi_ports[console->index];
1235
        int ret;
1236
 
1237
        if (console->index < 0 || console->index >= hvsi_count)
1238
                return -1;
1239
 
1240
        /* give the FSP a chance to change the baud rate when we re-open */
1241
        hvsi_close_protocol(hp);
1242
 
1243
        ret = hvsi_handshake(hp);
1244
        if (ret < 0)
1245
                return ret;
1246
 
1247
        ret = hvsi_get_mctrl(hp);
1248
        if (ret < 0)
1249
                return ret;
1250
 
1251
        ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR);
1252
        if (ret < 0)
1253
                return ret;
1254
 
1255
        hp->flags |= HVSI_CONSOLE;
1256
 
1257
        return 0;
1258
}
1259
 
1260
static struct console hvsi_con_driver = {
1261
        .name           = "hvsi",
1262
        .write          = hvsi_console_print,
1263
        .device         = hvsi_console_device,
1264
        .setup          = hvsi_console_setup,
1265
        .flags          = CON_PRINTBUFFER,
1266
        .index          = -1,
1267
};
1268
 
1269
static int __init hvsi_console_init(void)
1270
{
1271
        struct device_node *vty;
1272
 
1273
        hvsi_wait = poll_for_state; /* no irqs yet; must poll */
1274
 
1275
        /* search device tree for vty nodes */
1276
        for (vty = of_find_compatible_node(NULL, "serial", "hvterm-protocol");
1277
                        vty != NULL;
1278
                        vty = of_find_compatible_node(vty, "serial", "hvterm-protocol")) {
1279
                struct hvsi_struct *hp;
1280
                const uint32_t *vtermno, *irq;
1281
 
1282
                vtermno = of_get_property(vty, "reg", NULL);
1283
                irq = of_get_property(vty, "interrupts", NULL);
1284
                if (!vtermno || !irq)
1285
                        continue;
1286
 
1287
                if (hvsi_count >= MAX_NR_HVSI_CONSOLES) {
1288
                        of_node_put(vty);
1289
                        break;
1290
                }
1291
 
1292
                hp = &hvsi_ports[hvsi_count];
1293
                INIT_DELAYED_WORK(&hp->writer, hvsi_write_worker);
1294
                INIT_WORK(&hp->handshaker, hvsi_handshaker);
1295
                init_waitqueue_head(&hp->emptyq);
1296
                init_waitqueue_head(&hp->stateq);
1297
                spin_lock_init(&hp->lock);
1298
                hp->index = hvsi_count;
1299
                hp->inbuf_end = hp->inbuf;
1300
                hp->state = HVSI_CLOSED;
1301
                hp->vtermno = *vtermno;
1302
                hp->virq = irq_create_mapping(NULL, irq[0]);
1303
                if (hp->virq == NO_IRQ) {
1304
                        printk(KERN_ERR "%s: couldn't create irq mapping for 0x%x\n",
1305
                                __FUNCTION__, irq[0]);
1306
                        continue;
1307
                }
1308
 
1309
                hvsi_count++;
1310
        }
1311
 
1312
        if (hvsi_count)
1313
                register_console(&hvsi_con_driver);
1314
        return 0;
1315
}
1316
console_initcall(hvsi_console_init);

powered by: WebSVN 2.1.0

© copyright 1999-2025 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.